#include <iostream>

double light2tian(double light) {
    return light * 63240.0; // 1光年 = 63240天
}

int main() {
    double num{0};

    std::cout << "Enter the number of light years: ";
    std::cin >> num;
    std::cout << num << " light years = " << light2tian(num) << " astronomical units.";

    return 0;
}